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The effects of baffle configuration and number on inertial mixing in a curved serpentine micromixer: Experimental and numerical study
- Publication Year :
- 2021
- Publisher :
- ELSEVIER, 2021.
-
Abstract
- Recently, the application of micromixers in microfluidic systems including chemical and biological assays has been widely accomplished. Passive micromixers, benefitting from the low-cost and a less-complex fabrication process, rely solely on their geometry. In particular, Dean vortices generated in curved microchannels enhance the mixing performance through chaotic advection. To improve the mixing performance at relatively low Reynolds numbers (i.e. 1 ≤ Re ≤ 50), this study introduces baffles into the side walls of curved serpentine micromixers with curvature angles of 280°, which constantly agitate, stretch and fold the fluids streams. Six different baffle configurations were designed and the effects of geometry and the number of baffles were investigated both experimentally and numerically. According to the experimental results, while the maximum outlet mixing index of the micromixer with no baffles was 0.61, that of the micromixer with quasi-rectangular baffles was 0.98 at a low Reynolds number of 20, indicating the major contribution of the generated chaotic advection by baffles. Furthermore, numerical results, which were in good agreement with experimental results, shed more light onto the mechanisms involved in micromixing in terms of the flow behavior and mixing index.
- Subjects :
- Materials science
Strategic, Defence & Security Studies
General Chemical Engineering
010401 analytical chemistry
Flow (psychology)
Micromixer
Reynolds number
Baffle
02 engineering and technology
General Chemistry
Mechanics
Chemical Engineering
021001 nanoscience & nanotechnology
Curvature
01 natural sciences
0102 Applied Mathematics, 0904 Chemical Engineering, 0911 Maritime Engineering, 0914 Resources Engineering and Extractive Metallurgy
0104 chemical sciences
Micromixing
Vortex
Computer Science::Other
Physics::Fluid Dynamics
symbols.namesake
symbols
0210 nano-technology
Mixing (physics)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....3505dd35b628280f139d67d09ead8e04